Unnamed Occurrence (ARDF - WI026; east of head of Bonanza Creek), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - WI026; east of head of Bonanza Creek)	- not defined -
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See also unnamed occurrences WI001 and WI002. This occurrence is located in Gates of the Arctic National Park.
Location: This occurrence is about 1 mile southeast of the small lake at the head of Bonanza Creek; it is on the west slope of the ridge between Bonanza and Conglomerate Creeks. The occurrence is at elevation of about 3,300 feet, about 0.4 mile north-northwest of the center of section 25, T. 32 N., R. 15 W., of the Fairbanks Meridian. The location is accurate within about three-quarters of a mile.
Geology: Brosge and Reiser (1960) originally describe this occurrence as a galena-bearing quartz vein in Middle(?) Devonian slate, phyllite and siltstone. Kurtak and others (1999) describe a 35-foot-wide by 150-foot-long area of rusty-weathering, intensely fractured and dolomitized metamorphic rock that they tentatively interpret as a northwest-trending shear zone. The rock is cut by numerous quartz veinlets containing traces of galena, sphalerite, and possibly ankerite(?). A sample of quartz float downslope from the outcrop contains traces of galena, sphalerite, siderite, and ankerite, and 3,510 ppm zinc, 3,438 ppm lead, and 3,772 ppm arsenic.
Workings: Only surface sampling.
Alteration: Rusty weathering, intense fracturing, and dolomitization.

Commodities (Major) - Pb, Zn; (Minor) - As
Development Status: None
Deposit Model: Polymetallic vein (?) (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	WI026

Other Regions, Features and Areas containing this locality

References